A kind of reinforced concrete post and steel I-beam connecting joint structure
The utility model relates to a kind of reinforced concrete post and steel I-beam connecting joint structure, belongs to building engineering field, is applicable to industry and is connected with steel I-beam with reinforced concrete post in civilian construction.
Along with the development of building types, at some highrise buildings, newly construct the factory buildings and greatly across venue, also have the enlarging of some transformation projects and add in layer construction, there is increasing novel Mixed Architecture.Consider that reinforced concrete post and steel I-beam combining structure have the two-fold advantage of steel work and concrete structure, compare with steel work and there are saving steel, increase the feature of the rigidity of member and building; Compare with concrete structure there is the cross section of reducing, weight, increase the feature of member ductility, therefore in building, be widely used.For guaranteeing reinforced concrete post and steel I-beam transmission internal force reliably, both connections must have rational structural form.In engineering, conventional reinforced concrete post and steel I-beam type of attachment have: be rigidly connected, flexibly connect and semi-rigid connection at present.
The rigidly connected key of steel I-beam and reinforced concrete post is how to pass through rational construction measure, make girder steel end moment of flexure, axle power and shearing pass to safely and reliably concrete column itself.As the connected node form of a kind of reinforced concrete post and steel I-beam, the mode of being rigidly connected is applicable to girder steel span and stressedly uses when larger.Rigid connection node place, girder steel end plate is fixed on concrete column by chemical anchor bolts or expansion anchor, the junction plate stretching out on end plate adopts high-strength bolt to be connected with steel beam web plate, the upper bottom flange bevel of girder steel adopts butt weld to be connected with end plate, to reduce the maximal bending moment of beam, thereby depth of beam is reduced, save steel.But there is following shortcoming in the method rigidly connecting: construction process is complicated; The junction of steel I-beam and concrete column is subject to tension and compression and shearing action is easily loosening, node destructible, and frequency of maintenance is high.
At present in engineering, the most frequently used reinforced concrete post and the connected mode of steel I-beam are hinged, belong to and flexibly connect.Hinged job practices is simple, and power transmission is clear and definite.But hinge method is Shortcomings equally also: girder steel span and stressed being not suitable for when larger are used; The hinged i iron depth of beam that requires is larger, and steel use amount is large, and economic cost is higher.
Semi-rigid connection is also a kind of conventional connection pattern, and it mainly connects pattern has: meridosternous angle steel connects, two web-angle connects, low end connects the steel connection of ,Ding base angle and is connected with short T-steel.But because the at present domestic method for designing to this category node lacks concrete norm, therefore, in the overall calculation of girder steel, still adopt hinged model to calculate.
Existing a kind of concrete column and steel beam connecting joint structure, comprise concrete column, high-strength bolt, connecting angle and girder steel, the pre-buried high-strength bolt of concrete column wherein, at horizontal Y-direction concrete column, by pre-buried high-strength bolt, be connected with connecting angle, in horizontal X, to connecting angle, be connected with girder steel, above-mentioned girder steel and concrete column form movable connected node in horizontal X, Y-direction.This node structure can be at reinforced concrete post pre-embedded steel slab and high-strength bolt, having realized X, bis-horizontal directions of Y and concrete column movably only vertical, Z-direction is Immobile is articulated and connected, do not consider the hogging moment that opposing Nodes may occur, limited by bonding strength, it resists the limited in one's ability of vertical load.
In sum, although the connecting joint structure of current existing steel I-beam and reinforced concrete post can meet the requirement of current specifications, at aspects such as stress performance, supporting capacity, intensity, remain and can improve part.Given this, for further improving the bonding strength of steel I-beam and reinforced concrete post, need at present that invention a kind of easy construction, bonding strength are high badly, the Novel reinforced concrete post of good integrity and the connecting joint structure of steel I-beam.
Summary of the invention
The purpose of this utility model is to provide that a kind of easy construction, bonding strength are high, the Novel reinforced concrete post of good integrity and the connecting joint structure of steel I-beam.
In order to realize above-mentioned technical purpose, the utility model has adopted following technical scheme:
And a steel I-beam connecting joint structure, is characterized in that structure mainly comprises reinforced concrete post and steel I-beam; Steel plate folder concrete suspension bridging piece defaults in the bracket position of reinforced concrete post, is preset with the high-strength bolt being connected with steel I-beam in it; Steel I-beam is placed on steel plate folder concrete suspension bridging piece, and is connected with steel plate folder concrete suspension bridging piece with reinforced concrete post by built-in connection, high-strength bolt; Annular stop stirrup is arranged circumferentially along reinforced concrete post, and contacts with steel I-beam upper surface, is provided with the support floor being welded to connect with steel I-beam on stirrup.
Described steel plate folder concrete suspension bridging piece comprises billet, Concrete Filled body and lower billet from top to bottom successively; ; Lower billet is L-shaped, and minor face one end is embedded in reinforced concrete post in advance, and reserved steel bar concrete column vertical reinforcement and built-in connection through hole; The reserved hole that supplies high-strength bolt and built-in connection to pass on upper billet.
Described built-in connection is L-shaped, and minor face is embedded in advance bracket reinforced concrete post Zhong，Chang limit and by nut, fixedly bolt connector is set ，Bing end through steel plate folder concrete suspension bridging piece and steel I-beam bottom flange.
Described high-strength bolt bottom is welded in the upper surface of lower billet, and the length of stretching out billet is not less than 50mm ~ 80mm.
Described steel I-beam stretches in the reserved groove of reinforced concrete post, and at the default hole that supplies built-in connection and high-strength bolt to pass of connecting portion.
In the space of reinforced concrete post and steel I-beam contact position, be filled with space obturator.Space obturator can adopt special mortar, building sealant, high-strength cement only to starch.
The utlity model has following feature and beneficial effect:
(1) at reinforced concrete post and steel I-beam connected node place, steel plate folder concrete suspension bridging piece is set, can increases the contact area of reinforced concrete post and steel I-beam, contribute to significantly to promote anti-bending bearing capacity and the globality of node.
(2) steel I-beam presss from both sides between concrete suspension bridging piece and is connected with high-strength bolt by built-in connection with reinforced concrete post, steel plate, and job practices is simple, and speed of application is fast, and construction quality is easily controlled.
(3) the annular stop stirrup arranging both can prevent node generation local failure, also can be opposing negative moment of backing plate counter-force is provided.
(4) under reinforced concrete post and steel I-beam connected node, bracket is set, steel I-beam one end is stretched in the reserved groove in reinforced concrete post simultaneously, increases the shear strength of node.
Accompanying drawing explanation
Fig. 1 is the utility model reinforced concrete post and axle i-beam node structural representation;
Fig. 2 is Fig. 1 light plate folder concrete suspension bridging piece structural representation;
In figure: 1-reinforced concrete post, 2-steel plate folder concrete suspension bridging piece, 3-steel I-beam, 4-high-strength bolt, 5-built-in connection, 6-i iron web, 7-i iron bottom flange, 8-nut, 9-bracket, 10-space obturator, 11-annular stop stirrup, the upper billet of 12-, 13-Concrete Filled body, billet under 14-, 15-supports floor.
The specific embodiment
In the present embodiment such as the design parameters of reinforced concrete post design parameters and construction technical requirement, steel plate (reinforcing bar) welding procedure technical requirements, the technical requirements of bolt connection construction, the requirement of steel I-beam Hoisting Construction Technology, Concrete Filled body and construction technical requirement, be not repeated, specifically set forth the embodiment that the utility model relates to structure.
Fig. 1 is the utility model reinforced concrete post and axle i-beam node structural representation, and Fig. 2 is Fig. 1 steel plate folder concrete suspension bridging piece structural representation.Shown in Fig. 1, Fig. 2, the connecting joint structure of this reinforced concrete post and steel I-beam is mainly comprised of steel plate folder concrete suspension bridging piece 2, built-in connection 5, high-strength bolt 4, annular stop stirrup 11, space obturator 10 etc.
The diameter of reinforced concrete post is 600mm, 12 indented barss that diameter is 12mm of vertical laying in post, and steel strength grade is HRB335; Strength grade of concrete is C35, and protective layer thickness is 40mm;
The thickness of steel plate folder concrete suspension bridging piece 2 is 30mm; Upper billet 12 and lower billet 14 in steel plate folder concrete suspension bridging piece 2 are prefabrication, and upper billet 12 and lower billet 14 all adopt stainless steel gasket, and steel plate thickness is 8mm, and hardness is HRC43-47, and width is identical with steel I-beam 3; Lower firm pad 14 is " L " type, and the long 100mm of minor face, is embedded in reinforced concrete post in advance, and long length of side 500mm, stretches out reinforced concrete post 400mm, and in plate, reserved steel bar concrete column vertical reinforcement and built-in connection passes hole; The long 400mm of upper billet 12, the reserved hole that supplies high-strength bolt and built-in connection to pass on upper billet.Concrete Filled body 13 adopts the pea gravel concreten that strength grade is C40.
Built-in connection 5 adopts the indented bars that diameter is 12mm, is prefabricated into " L " shape, and steel strength grade is HRB335; Wherein, the long 30mm of minor face, is embedded in bracket 9 concrete in advance; Long length of side 300mm arranges bolt connector through steel plate folder concrete suspension bridging piece and ，Bing end, steel I-beam bottom flange.
Bracket 9 reinforcing bars all adopt HRB335 reinforcing bar, and diameter is 12mm, and concrete all adopts C35 concrete.
High-strength bolt 4 diameters are 10mm, and strength grade is 10.9s level, adopt and are welded to connect with lower billet 14, and fastening with steel I-beam bottom flange 7 use nuts 8, the external diameter of high-strength bolt 4 is 10mm.
Steel I-beam 3 is prefabrication steel I-beam, and steel I-beam web 6 height are 200mm, thick 9mm; I iron flange width 102mm, thick 11.4mm, material adopts Q235B steel.The bolt that the reserved diameter in end, bottom flange is 13mm is through hole.
During construction, first install the template of reinforced concrete post 1 and Concrete Filled body 13, then built-in fitting 5 and lower billet 14 are fixed to relevant position, the horizontal end of built-in fitting 5 is welded on the reinforcing bar in reinforced concrete post 1, perpendicular end passes reinforced concrete post 1, is exposed in reserved groove.
Build the bracket 9 under reinforced concrete post 1, Concrete Filled body 13 and connected node simultaneously.Concrete adopts C35 concrete.Meanwhile, connecting the groove that the reserved degree of depth in steel I-beam 3 places is 30mm.While building, protective sleeve on a headgear of the high-strength bolt 4 on lower billet 14, concrete binding, in the end of high-strength bolt 4, brings inconvenience to later stage installation process when preventing from building.
Install successively billet 12 and steel I-beam 3, the position of the corresponding high-strength bolt 4 of the spacing hole on steel I-beam bottom flange 7 and built-in connection 5 is installed, beam-ends embeds reserved groove, and fastening with nut 8.
Annular stop stirrup 11 is highly 100mm, and thickness is 10mm, adopts the steel plate that strength grade is Q235, around reinforced concrete post, is arranged circumferentially, and is prefabricated into the stirrup that internal diameter is 600mm, and joint is with bolts; The support floor 15 being welded to connect with steel I-beam is set on stirrup, and it is highly 100mm, and length is 150mm, and thickness is 10mm, adopts prefabricated the forming of steel plate that strength grade is Q235.
After steel I-beam has connected, backfill space obturator 10 in reserved groove, space obturator 10 adopts epoxy resin mortar, epoxy resin mortar forms with synthetic resin strengthening agent and powder, fine aggregate configuration, its compressive strength > 105Mpa, rupture strength > 25Mpa, pressurized bullet mould 18.000Mpa.